CN100372141C

CN100372141C - Composite Joule treating method for high impedance material

Info

Publication number: CN100372141C
Application number: CNB2003101184697A
Authority: CN
Inventors: 周少雄; 李德仁; 卢志超; 陈孝文; 刘辉; 韩伟
Original assignee: Advanced Technology and Materials Co Ltd
Current assignee: Advanced Technology and Materials Co Ltd
Priority date: 2003-12-18
Filing date: 2003-12-18
Publication date: 2008-02-27
Anticipated expiration: 2023-12-18
Also published as: CN1553525A

Abstract

The present invention belongs to the technical field of a manufacturing method for functional materials, and particularly relates to a composite Joule processing method which is especially suitable for preparing high magnetic impedance materials. The method comprises: step one, low current density joule processing is carried out for the high magnetic impedance materials in a long time, and the rise time of current is from 1 to 10 second; the maximum density of the current is from 5 to 23 A/mm<2>, and the holding time of the current is from 8 to 120 seconds; the time of reducing the current from the maximum current density to 0 is from 0.01 to 1 second; step two, high current density joule processing is carried out in a short time, and the rise time of current is from 0.01 to 1 second; the maximum density of the current is from 26 to 45 A/mm<2>, and the holding time of the current is from 1 to 60 seconds; the time of reducing the current from the maximum current density to 0 is from 0.001 to 0.1 second. The time interval of the low current density joule processing in a long time and the high current density joule processing in a short time is larger than or equal to 120 seconds. Compared with the prior art, the method has the advantages of improving high magnetic impedance performance, maintaining the original toughness of materials and reducing production cost at the same time.

Description

The combined type joule processing method of giant magnetic impedance material

Technical field

The invention belongs to the method field of manufacturing of functional material, be particularly useful for making the combined type joule processing method of giant magnetic impedance material with magnetic-field-sensitive characteristic.

Background technology

In the prior art, the giant magnetic impedance material is a kind of novel magnetic-field-sensitive material that development in recent years is got up, its principle is to utilize the giant magnetic impedance of material (GMI) effect, promptly in conductor, pass to alternating current, responsive variation takes place with the variation of external magnetic field in the impedance of conductor, utilize the GMI effect can make highly sensitive magnetic-sensitive material, its magnetic field sensitivity can reach 10 ^-4More than the oersted, and response speed apparently higher than MR material, AMR material and GMR material (referring to K.Mohri, T.Uchiyama, L P.Shen, Sensitive Micro Magnetic Sensor Family UtilizingMagneto-impedance and Stress-impedance Effects for IntelligentMeasurements and Controls.Sensors and Actuators A, 2001,91:85-90.), therefore become a present application study focus.The major parameter of weighing the GMI material property has maximum resistance variation rate and magnetic field sensitivity.For rate of change and the magnetic field sensitivity that improves impedance, people have done a large amount of work at the composition architectural study of material and post-processing approach and process aspect, and carried out deep theoretical research, the result shows (referring to P.Ripka, L.Kraus, Magnetic Sensors and Magnetometer.MA:Artech House, 2001.350), the GMI material should have high magnetic permeability and transverse anisotropy simultaneously.For amorphous alloy, Co base amorphous and special component Fe base noncrystal alloy all have very high magnetic permeability later at nano-crystallization, are desirable GMI candidate materials.But, because amorphous alloy is inner residual very big internal stress in rapid solidification, and the distribution of internal stress is uneven, this uneven internal stress and magnetostriction interact, it also is uneven causing anisotropy of material, and promptly the anisotropic orientation in each different internal stress district is different.Distribute although amorphous alloy has uneven internal stress in the preparation attitude, the internal stress of material is to change by the reprocessing to material.Isothermal heat treatment method is one of method of using always, and amorphous alloy has been eliminated the inhomogeneities of stress through after the isothermal annealing, but has also reduced anisotropy of material simultaneously, is unfavorable for producing the GMI effect.It is to change the another kind of effective method that the material anisotropy distributes that the direct current joule is handled, in order to obtain stronger transverse anisotropy, need carry out the joule processing of high current density to material, the shortcoming of this processing method is that the material after handling becomes fragile, and is unfavorable for practical application.

Summary of the invention

The objective of the invention is to propose a kind of giant magnetic impedance of raising performance that has, also keep the former flexible of material simultaneously, and the combined type joule processing method of the giant magnetic impedance material that reduces production costs.

According to above-mentioned purpose, the feature of the technical scheme that we propose is after amorphous material is carried out long-time low current density joule processing, to carry out short time high current density joule again and handle, and concrete steps are:

When (1) long-time low current density joule was handled, the rise time of electric current was 1-10 second; Maximum current density is 5-23A/mm ², the electric current retention time is 8-120 second; It is 0.01-1 second that electric current is reduced to time of 0 from maximum current density;

When (2) short time high current density joule was handled, the rise time of electric current was 0.01-1 second; Maximum current density is 26-45A/mm ², the electric current retention time is 1-60 second; It is 0.001-0.1 second that electric current is reduced to time of 0 from maximum current density;

(3) long-time low current density joule is handled and the time interval 〉=120 of short time high current density joule processing second.

The further feature of the inventive method is that the giant magnetic impedance material of above-mentioned indication is the amorphous state metal sheet band in addition, can also be the amorphous filament.

The operation principle of the technical scheme that we adopt is: at first material is applied long low current density joule and handle, purpose is to eliminate the uneven internal stress of material internal by structural relaxation, and generates less transverse anisotropy; Then material being applied the high current density joule of short time handles, purpose is to make magnetic domain consistent turning to laterally under the transverse magnetic field that vertically big electric current produces, thereby produce very strong transverse anisotropy, simultaneously because being rapidly heated and the fast cooling effect of handling of short time joule, the transverse anisotropy who inducts at material internal is because fast cooling and " being freezed ".Therefore, the material after second section joule handled has very strong transverse anisotropy.

The advantage that adopts the inventive method compared with prior art to have is: it is optimized the giant magnetic impedance performance and improves more than 2 times, also keep the former flexible of material simultaneously, performance is easy to control in the sample treatment process, and the processing time is shorter, make the producing cost of product promptly use cost to reduce 30-50%, to stable its better effects if of production giant magnetic impedance material product in batches.

Embodiment

The embodiment of the invention is the contrast experiment who carries out at amorphous alloy ribbon, and the material therefor composition is Co _71.8Fe _4.9Nb _0.8Si _7.5B ₁₅, adopt the quick cooling method spray to become amorphous ribbon, the table 1 of the concrete specification of amorphous thin ribbon and the visible embodiment of parameter of processing method.See Table 2 with the performance comparison of prior art.Being numbered 1-16 in table 2 is the prepared sample of the inventive method, and being numbered 17-19 is the sample of art methods preparation.Be numbered 17,18,19 and be contrast material in following contrast table, composition is Co _71.8Fe _4.9Nb _0.8Si _7.5B ₁₅, wherein being numbered 17 samples and adopting the preparation of isothermal annealing method, annealing temperature is 450 ℃, and annealing time is 30 minutes, carries out under the argon atmospher protection, and it is very crisp that the sample after the annealing becomes, and so the service condition of this sample is harsh, the scope of application is restricted.Being numbered 18 sample and being through current density is 52A/mm ²Sample after the high current density joule is handled, although toughness makes moderate progress than isothermal annealing sample, the maximum resistance variation rate of this sample handle less than the inventive method sample the maximum resistance variation rate 1/2.Have again that to be numbered 19 sample be to be 45A/mm through current density under 80MPa stress ²Sample after joule handling, the maximum resistance variation rate of this sample only for the inventive method handle sample the maximum resistance variation rate about 1/3, toughness be the inventive method processing sample toughness about 1/2.

Table 1 embodiment of the invention amorphous alloy ribbon giant magnetic impedance material specification and treatment process parameter list

Numbering	Length (mm)	Width (mm)	Thickness (μ m)	Long-time low current density joule is handled				Second blanking time	Short time high current density joule is handled
				Long-time low current density joule is handled					Short time high current density joule is handled				Second rise time	Second retention time	Maximum current density A/mm ²	Second fall time	Second rise time	Second retention time	Maximum current density A/mm ²	Second fall time
				1	85	0.61	25		2 seconds	25 seconds	23A/mm ²	1 second	Second rise time	Second retention time	Maximum current density A/mm ²	Second fall time	Second rise time	Second retention time	Maximum current density A/mm ²	Second fall time	120 seconds	0.01 second	3 seconds	26A/mm ²	0.002 second
2	87	0.61	26	1	85	0.61	25	1 second	2 seconds	25 seconds	23A/mm ²	1 second	48 seconds	23A/mm ²	0.01 second	120 seconds	0.02 second	5 seconds	43A/mm ²	0.001 second	120 seconds	0.01 second	3 seconds	26A/mm ²	0.002 second
2	87	0.61	26	3	91	0.63	26	1 second	1 second	82 seconds	21A/mm ²	0.1 second	48 seconds	23A/mm ²	0.01 second	120 seconds	0.02 second	5 seconds	43A/mm ²	0.001 second	3600 seconds	0.05 second	5 seconds	36A/mm ²	0.002 second
4	81	0.61	27	3	91	0.63	26	3 seconds	1 second	82 seconds	21A/mm ²	0.1 second	67 seconds	23A/mm ²	0.02 second	240 seconds	1 second	3 seconds	43A/mm ²	0.003 second	3600 seconds	0.05 second	5 seconds	36A/mm ²	0.002 second
4	81	0.61	27	5	81	0.62	26	3 seconds	5 seconds	86 seconds	15A/mm ²	0.05 second	67 seconds	23A/mm ²	0.02 second	240 seconds	1 second	3 seconds	43A/mm ²	0.003 second	320 seconds	0.7 second	7 seconds	45A/mm ²	0.005 second
6	83	0.61	26	5	81	0.62	26	8 seconds	5 seconds	86 seconds	15A/mm ²	0.05 second	92 seconds	12A/mm ²	0.8 second	400 seconds	0.9 second	4 seconds	30A/mm ²	0.02 second	320 seconds	0.7 second	7 seconds	45A/mm ²	0.005 second
6	83	0.61	26	7	86	0.61	29	8 seconds	10 seconds	110 seconds	6A/mm ²	0.6 second	92 seconds	12A/mm ²	0.8 second	400 seconds	0.9 second	4 seconds	30A/mm ²	0.02 second	480 seconds	0.3 second	55 seconds	32A/mm ²	0.03 second
8	90	0.60	26	7	86	0.61	29	4 seconds	10 seconds	110 seconds	6A/mm ²	0.6 second	120 seconds	8A/mm ²	0.9 second	560 seconds	0.4 second	51 seconds	44A/mm ²	0.04 second	480 seconds	0.3 second	55 seconds	32A/mm ²	0.03 second
8	90	0.60	26	9	89	0.61	25	4 seconds	5 seconds	115 seconds	6A/mm ²	0.02 second	120 seconds	8A/mm ²	0.9 second	560 seconds	0.4 second	51 seconds	44A/mm ²	0.04 second	640 seconds	0.2 second	4 seconds	43A/mm ²	0.05 second
10	91	0.62	20	9	89	0.61	25	5 seconds	5 seconds	115 seconds	6A/mm ²	0.02 second	118 seconds	5A/mm ²	0.02 second	720 seconds	0.1 second	6 seconds	30A/mm ²	0.02 second	640 seconds	0.2 second	4 seconds	43A/mm ²	0.05 second
10	91	0.62	20	11	95	0.61	22	5 seconds	5 seconds	9 seconds	23A/mm ²	0.3 second	118 seconds	5A/mm ²	0.02 second	720 seconds	0.1 second	6 seconds	30A/mm ²	0.02 second	800 seconds	0.6 second	1 second	35A/mm ²	0.09 second
12	82	0.61	26	11	95	0.61	22	6 seconds	5 seconds	9 seconds	23A/mm ²	0.3 second	12 seconds	22A/mm ²	0.5 second	1200 seconds	0.08 second	2 seconds	38A/mm ²	0.1 second	800 seconds	0.6 second	1 second	35A/mm ²	0.09 second
12	82	0.61	26	13	98	0.61	23	6 seconds	7 seconds	32 seconds	11A/mm ²	0.6 second	12 seconds	22A/mm ²	0.5 second	1200 seconds	0.08 second	2 seconds	38A/mm ²	0.1 second	1600 seconds	0.05 second	3 seconds	40A/mm ²	0.008 second
14	78	0.63	22	13	98	0.61	23	2 seconds	7 seconds	32 seconds	11A/mm ²	0.6 second	56 seconds	12A/mm ²	0.1 second	1800 seconds	0.6 second	5 seconds	40A/mm ²	0.006 second	1600 seconds	0.05 second	3 seconds	40A/mm ²	0.008 second
14	78	0.63	22	15	88	0.62	26	2 seconds	1 second	78 seconds	15A/mm ²	1 second	56 seconds	12A/mm ²	0.1 second	1800 seconds	0.6 second	5 seconds	40A/mm ²	0.006 second	7200 seconds	0.2 second	12 seconds	42A/mm ²	0.008 second
16	86	0.61	26	15	88	0.62	26	1 second	1 second	78 seconds	15A/mm ²	1 second	8 seconds	23A/mm ²	0.06 second	9800 seconds	0.8 second	2 seconds	41A/mm ²	0.02 second	7200 seconds	0.2 second	12 seconds	42A/mm ²	0.008 second

The properties of sample contrast table of table 2 embodiment of the invention and prior art

Sample of the present invention	Numbering	Maximum resistance variation rate %	Reduction breaking strain %
	Numbering	Maximum resistance variation rate %	Reduction breaking strain %	1	353	0.85
	2	331	0.82	1	353	0.85
	2	331	0.82	3	320	0.91
	4	356	0.86	3	320	0.91
	4	356	0.86	5	330	0.80
	6	356	0.82	5	330	0.80
	6	356	0.82	7	362	0.92
	8	330	0.91	7	362	0.92
	8	330	0.91	9	320	0.89
	10	365	0.88	9	320	0.89
	10	365	0.88	11	360	0.86
	12	340	0.83	11	360	0.86
	12	340	0.83	13	350	0.81
	14	352	0.83	13	350	0.81
	14	352	0.83	15	332	0.85
	16	310	0.88	15	332	0.85
	16	310	0.88	The prior art sample	17	80	0.36
18	160	0.42			17	80	0.36
18	160	0.42	19		120	0.46

Claims

1. the combined type joule processing method of a giant magnetic impedance material is characterized in that amorphous material is carried out carrying out short time high current density joule again and handling after long-time low current density joule handles, and its concrete step is:

When (1) long-time low current density joule was handled, the rise time of electric current was 1-10 second, and maximum current density is 5-23A/mm ², the electric current retention time is 8-120 second, it is 0.01-1 second that electric current is reduced to time of 0 from maximum current density;

When (2) short time high current density joule was handled, the rise time of electric current was 0.01-1 second, and maximum current density is 26-45A/mm ², the electric current retention time is 1-60 second, it is 0.001-0.1 second that electric current is reduced to time of 0 from maximum current density;

2. processing method according to claim 1 is characterized in that the giant magnetic impedance material that the combined type joule is handled is the amorphous state metal sheet band.

3. processing method according to claim 1 is characterized in that the giant magnetic impedance material that the combined type joule is handled is the amorphous state filament.